Design of an Industrial Building

Weight of Roofing Material= Roof Slope = Live Load =

2 0.16 KN/m

15 degrees 2 0.514 N/m on plan

Length of Building, L =

28.3 m

Breadth of Building, W =

18.3 m

Height from Ground Level, H =

12 m

Pitch of Roof Trusses =

1/8

Roof Overhangs over walls =

300 mm

Wind Speed Zone = 47 m/sec Design Period = 50 years Factor k1 = 1.0 Factor k2 = 1.07 (Category 2) (Class A) Factor k3 = 1.018 For Medium permeability,Cpi =

0.2

0.646495

1 Design Wind Speed, Vz

=

Vb*k1*k2*k3 =

Row No.

51.20 m/sec 0.6*Vz2

2 Design Wind Pressure, Pz =

= 1572.57

1 1.57 KN/m

2

2 3

(a) Design Pressure on walls = H/W= L/W=

0.65574 1.54645

4 5

Wind Angle Value of Cpi 0⁰ 90⁰

0.2 -0.2 0.2 -0.2

Using the above values in adjoining table, we get:Wind Angle A B C D 0 0.7 -0.3 -0.7 -0.7 90 -0.5 -0.5 0.7 -0.1 Local Cpe near A B C D 0.5 0.9 -0.7 -0.3

-0.5 -0.1 -0.7 -0.3

-0.9 -0.5 0.5 0.9

-0.9 -0.5 -0.3 0.1

Largest inward or outward pressure on any wall = = and near the corners =

(b) Design Pressure on Roof =

2 2.04 KN/m

2 1.42 KN/m

-1.3 -0.9 -1.3 -0.9

6 Cpe 7 -1.1 8 9

Pe

=

2 1.730 KN/m

For general surface

Pe1

=

2 3.067 KN/m

For local areas

Pressure on local areas is used for checking the sheeting & there connections Pressure Pe will be used for checking & designing Purlins

External Pressure Coefficients(Cpe) for walls of rectangular clad Buildings

Building Height Building Ratio Ratio Plan Wind Angle ᶿ 1
L/W=1.0 L/W=2.0

Cpe for surface

0

A 0.7

B -0.2

C -0.5

D -0.5

90

-0.5

-0.5

0.7

-0.2

0 90 0 90 0 90 0 90 0 90 0 90 0 90 0

0.7 -0.7 0.7 -0.6 0.7 -0.5 0.8 -0.8 0.7 -0.5 0.95 -0.8 0.95 -0.7 0.85

-0.25 -0.5 -0.25 -0.6 -0.3 -0.5 -0.25 -0.8 -0.4 -0.5 -1.85 -0.8 -1.25 -0.7 -0.75

-0.6 0.7 -0.6 0.7 -0.7 0.7 -0.8 0.8 -0.7 0.8 -0.9 0.9 -0.7 0.95 -0.75

-0.6 -0.1 -0.6 -0.25 -0.7 -0.1 -0.8 -0.25 -0.7 -0.1 -0.9 -0.85 -0.7 -1.25 -0.75

90

-0.75

-0.75

0.85

-0.75

H is the height to eaves or parapet, L is the horizontal dimension of the building and w is the lesser horizontal dimension of a building.

Internal Pressure Coefficient

Permeability Low Medium High

Opening in terms of % Co-efficient wall area 5% 5-20% >20%

±0.2 ±0.5 ±0.7

Local Cpe near corner -0.8 -1.01 -1.1 -1.1 -1.2 -1.2 -1.25 -1.25 -1.0

For angle = 15⁰

E

F

G

H

I

J

K

L

θ=0ͦͦ⁰ θ=90ͦͦ⁰ θ=0⁰ 0.2 -0.2 θ=90⁰ 0.2 -0.2

0.9 -0.8

0.9 -0.6

-0.55 -0.8

-0.55 -0.6

-1.75 -1.75

-1.75 -1.75

-1.5 -1.5

-1.1 -1.1

0.7 1.1

0.7 1.1

-0.75 -0.35

-0.75 -0.35

-1.95 -1.55

-1.95 -1.55

-1.7 -1.3

-1.3 -0.9

-1 -0.6

-0.8 -0.4

-1 -0.6

-0.8 -0.4

-1.95 -1.55

-1.95 -1.55

-1.7 -1.3

-1.3 -0.9

Maximum of above coefficients = Coefficient for Pe =

1.1

Coefficient for Pe1 =

1.95

Dimensions of a Solar Panel =

1195*541*35 mm =

0.65 m

2

Weight of Solar Panel of Above Mentioned size = Angle of inclination of Truss =

30 degrees

Surface Area available for laying solar panels = Wt. of Solar Panels Above Roof Trusses =

8.5 kg

2 3357.44 m

44143 Kg = 44.14 MT